Variations
Kenneth B. Platnick in Great Mysteries of History, 1973, gives a variety of details that are not in the other accounts of Anderson's story. It names the asylum she was held at in the 1920's as Dalldorf Sanitarium, states that the admitting physician diagnosed her as having partial amnesia and paranoid delusions, and names the patient that "recognized" her as being Anastasia -- Klara Marie Peuthert, as well as Baron Arthur von Kleist as the name of the man that put Peuthert in contact with the Russian emigres. He also gives Baroness Isa Buxhoevedan as the name of the specific emigre that assisted Peuthert; Buxhoevedan had been a lady-in-waiting for Czarina Alexandra, and was therefore able to definitively state that "Miss Unknown" was not Tatitana. Platnick does not mention if she was involved in the re-identification of "Miss Unknown" as Anastasia.
Also according to this source, Anderson's claim was supported by a Berlin police Inspector named Albert Grunberg, who took her into his home after she left the sanitarium, and who was also responsible for having her meet with Princess Irene, as well as with Crown Princess Cecile of Germany.
Strange Stories, Amazing Facts, 1976, is the only source that mentions a specific date that Anderson was rescued from the canal on, given as February 17, 1920. This book's account also claims that she "carried papers in the name of Anna Tchaikovski," and that she made the claim to be Anatasia as soon as she "regained her strength in the hospital," failing to mention it was an asylum and that she was there for two years. Also, the date for the Romanov execution is given as July 19, not July 16. It is also the only source for the following details: that Anderson was examined at a hospital as part of a court case in 1933, and it was found that X-rays revealed serious head injuries that "could have been caused by the butt of a gun".
Due to obvious similarities in the stories presented, the source for this book's version of Anderson's story is likely Kenneth B. Platnick's book above, Great Mysteries of History, though Strange Stories, Amazing Facts carefully leaves out much information in Platnick's book that disputes Anderson's claim.
An Associated Press release from 1994 - "Mystery Solved: Genetic tests prove woman not Anastasia" - adds that, after the announcement of the DNA evidence, Prince Rostislav Romanov was quoted as saying "I never had a shadow of a doubt. My father was raised with Anatasia, and this woman would never see him."
And here's an interesting sideline: in 1994, a New York Times release - "Moscow is Almost Certain: Anastasia Died With Czar's Family" - stated a report was released to a Russian newspaper claiming that forensic and molecular studies on the Romanov skeletons, performed by both Russian and British scientists, proved that Anastasia was among the dead found in the grave. But in 1995, in an episode of the public television series NOVA, Dr. William Maples, an American forensic Anthropologist who was asked by Russian authorities to identify the Romanov skeletons stated that none of the bones could be identified as those of Anastasia, mainly because there are no vertebrae that can be shown to be young enough to belong to her; so Anatasia's body was not in the grave. This is repeated in 1997 in an episode of Great Mysteries and Myths of the Twentieth Century from the Learning Channel. I have yet to determine if the initial Russian report was wrong, misleading, or non-existant.
Great Mysteries and Myths of the Twentieth Century, 1997, gives a different version of her rescue story: that Alexander Tchaikovski (her supposed rescuer) was killed in a street brawl, and that she had simply abandoned their baby to the orphanage (with no mention of a mental breakdown). It also says that the theory of her being the missing Polish housewife Schanzkowska was put forward in 1926, not 1927 as my other sources say.
It attributes this quote to Grand Duchess Olga regarding Anderson's claim: "She is not the one she believes"... which is an interesting comment if true , as it implies that Olga's impression was that Anderson truthfully believed her claim, despite the incorrectness of it.
This video also states that the idea that royal doubters of Anderson's claims were holding out to keep her away from the "Treasure of the Czar's" which was rumoured to be stashed in American banks was rubbish. The truth was that the treasure didn't exist... other than the jewellery that the female members of the missing royal family had sewn into their undergarments, the Tzar's family had nothing left when they were shot.